| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1905 | ----- | z | ----- | z | 51.42 | 51.32 | 50.68 | a | 54.77 | 58.90 | 59.56 | 57.55 | 53.11 | 49.28 | 47.45 | 53.41 | ||||||||||
| 1906 | 47.66 | 48.75 | 47.89 | 51.32 | 51.92 | 54.88 | 59.90 | 58.18 | 56.68 | 55.26 | 49.93 | 47.90 | 52.52 | |||||||||||||
| 1907 | 44.27 | 50.34 | 45.71 | 50.37 | 53.37 | 55.00 | 58.55 | 58.45 | 56.05 | 56.18 | 51.00 | 49.45 | 52.39 | |||||||||||||
| 1908 | 48.34 | 45.31 | 45.89 | 49.12 | 49.08 | 53.68 | 58.61 | 55.79 | 56.02 | 53.05 | 51.77 | 47.05 | b | 51.14 | ||||||||||||
| 1909 | ----- | z | 45.39 | a | 46.89 | 49.72 | a | 50.19 | 54.18 | 56.60 | 58.08 | 57.42 | 55.45 | 49.26 | a | 46.27 | 51.77 | |||||||||
| 1910 | 43.06 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.60 | 47.60 | ||
| 1911 | 43.63 | a | 41.84 | 48.48 | 46.98 | 49.81 | 53.82 | 57.61 | 59.97 | 56.27 | 54.19 | 47.98 | 43.52 | 50.34 | ||||||||||||
| 1912 | 46.83 | a | 47.62 | 43.87 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.11 | |||
| 1913 | ----- | z | 44.52 | 45.39 | 48.15 | 52.56 | 55.12 | 59.58 | a | 60.26 | 57.88 | 55.02 | 49.38 | 46.10 | 52.18 | |||||||||||
| 1914 | 46.77 | 47.46 | 50.13 | 51.17 | 53.98 | 55.62 | 58.98 | 59.85 | 56.60 | 54.35 | 51.33 | 45.18 | 52.62 | |||||||||||||
| 1915 | 47.10 | 47.45 | 50.63 | 51.65 | 52.68 | 57.32 | 59.61 | 60.81 | 58.43 | 51.60 | b | 44.40 | e | 43.05 | 52.06 | |||||||||||
| 1916 | 37.95 | 45.47 | 43.52 | 46.08 | 44.98 | b | 47.27 | 53.94 | 51.94 | ----- | z | ----- | z | ----- | z | ----- | z | 46.39 | ||||||||
| 1917 | 42.05 | 38.84 | 39.56 | 43.35 | 45.32 | 46.00 | a | 53.68 | 53.19 | ----- | z | 51.23 | 39.42 | 45.84 | 45.32 | |||||||||||
| 1918 | 48.95 | 45.54 | 47.71 | 45.08 | 46.53 | 52.20 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.72 | a | 47.53 | |||||||
| 1919 | 48.11 | 46.70 | 47.53 | 48.87 | 50.98 | 53.40 | 55.47 | 57.56 | 55.92 | 50.53 | 44.38 | 44.84 | 50.36 | |||||||||||||
| 1920 | 44.29 | 43.79 | 43.77 | 45.23 | 47.66 | 52.73 | 55.39 | 58.90 | 57.50 | 54.94 | 50.23 | 47.84 | 50.19 | |||||||||||||
| 1921 | 46.03 | 46.91 | 48.37 | 48.55 | 50.82 | 56.37 | 58.34 | 59.19 | 58.40 | 54.73 | 52.07 | 49.00 | 52.40 | |||||||||||||
| 1922 | 42.94 | 43.46 | 43.68 | 46.28 | 51.56 | 57.73 | 58.18 | 58.95 | 58.98 | ----- | z | ----- | z | ----- | z | 51.31 | ||||||||||
| 1923 | ----- | z | ----- | z | ----- | z | 52.70 | 55.06 | 57.45 | 62.58 | 64.68 | 62.60 | 56.08 | 55.63 | 49.13 | 57.32 | ||||||||||
| 1924 | 48.56 | 51.59 | 48.23 | 52.38 | 56.08 | 57.72 | 60.13 | 61.13 | 57.23 | 53.35 | 50.62 | 45.16 | 53.52 | |||||||||||||
| 1925 | 46.76 | 48.80 | 47.66 | 50.82 | 53.40 | 56.37 | 59.40 | 58.05 | 57.28 | 55.53 | 49.83 | 50.00 | 52.83 | |||||||||||||
| 1926 | 48.61 | 50.71 | 52.77 | 54.11 | g | 55.08 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 51.80 | ||||
| 1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.05 | 60.05 | 58.92 | 55.74 | 52.47 | 45.47 | 55.61 | |||||||
| 1928 | 49.03 | 48.60 | 52.16 | 51.05 | 54.53 | 57.95 | 60.74 | 60.45 | 58.22 | 54.24 | 50.02 | 47.45 | 53.70 | |||||||||||||
| 1929 | 44.47 | 43.62 | 47.61 | 48.17 | 53.16 | 57.17 | 60.24 | 61.26 | 58.63 | 55.10 | 51.22 | 49.05 | 52.47 | |||||||||||||
| 1930 | 42.71 | 49.16 | 51.10 | 53.23 | 52.26 | 56.18 | 59.23 | 62.56 | 58.92 | 55.06 | 51.50 | 47.95 | 53.32 | |||||||||||||
| 1931 | 48.84 | 49.45 | 50.85 | 53.65 | 56.92 | 58.37 | 61.31 | 59.95 | 58.92 | 55.40 | 47.32 | 45.34 | 53.86 | |||||||||||||
| 1932 | 44.08 | 45.45 | 50.10 | 50.30 | 54.37 | 57.87 | 59.24 | 61.21 | 59.22 | 53.92 | 52.37 | 43.81 | 52.66 | |||||||||||||
| 1933 | 43.82 | 44.34 | 47.89 | 50.02 | 50.97 | 56.73 | 59.95 | 59.85 | 56.68 | 55.11 | 50.93 | 49.96 | f | 52.39 | ||||||||||||
| 1934 | 49.19 | j | 50.10 | b | 52.70 | d | 52.29 | d | 56.35 | e | 56.97 | 59.70 | f | ----- | z | ----- | z | ----- | z | ----- | z | 51.08 | 53.25 | |||
| 1935 | 46.98 | 50.10 | h | 46.38 | s | 55.00 | m | 53.72 | f | 57.72 | c | 59.98 | d | 61.61 | c | 58.73 | f | 54.68 | l | 50.61 | c | 50.90 | f | 55.38 | ||
| 1936 | 50.72 | k | 48.50 | r | 48.38 | a | 52.47 | 56.73 | 61.03 | 63.65 | 64.03 | 61.38 | 57.90 | 50.38 | 48.03 | 56.40 | ||||||||||
| 1937 | 40.40 | 46.04 | 49.29 | 49.37 | 53.21 | 57.78 | 61.60 | 61.77 | 59.68 | 56.52 | 53.97 | 51.35 | 53.42 | |||||||||||||
| 1938 | 49.68 | 48.34 | 49.06 | 51.90 | 54.89 | 60.10 | 59.58 | 60.05 | 58.83 | 54.52 | 49.00 | 48.02 | 53.66 | |||||||||||||
| 1939 | 48.08 | a | 45.75 | 48.97 | 51.47 | 55.23 | 57.52 | 60.47 | 58.48 | 57.42 | d | 54.19 | b | 49.62 | b | 51.15 | 53.20 | |||||||||
| 1940 | 50.60 | ----- | z | ----- | z | 54.35 | 56.56 | 57.47 | 60.77 | 61.19 | 60.22 | 58.27 | c | 50.75 | 50.92 | 56.11 | ||||||||||
| 1941 | 52.85 | 53.05 | 52.15 | 52.08 | 55.84 | 59.02 | a | 61.89 | c | 60.65 | 59.65 | 55.45 | 53.63 | 48.58 | a | 55.40 | ||||||||||
| 1942 | 48.77 | 46.82 | 47.12 | g | ----- | z | ----- | z | 58.38 | 61.97 | 61.26 | ----- | z | ----- | z | ----- | z | ----- | z | 55.44 | ||||||
| 1943 | ----- | z | ----- | z | ----- | z | 49.83 | 51.05 | 53.90 | 56.50 | 57.48 | 57.78 | 54.35 | 53.15 | 49.26 | 53.70 | ||||||||||
| 1944 | 47.84 | 45.55 | 46.50 | 48.28 | 51.03 | 54.23 | 56.79 | 58.85 | 55.75 | 55.11 | 51.18 | 51.76 | 51.91 | |||||||||||||
| 1945 | 49.23 | 47.04 | 45.53 | 47.68 | 51.23 | 55.12 | 56.39 | 56.06 | 56.17 | 52.53 | 49.53 | 48.31 | 51.23 | |||||||||||||
| 1946 | 45.87 | 45.20 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 45.53 | |||
| 1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 57.62 | z | 60.08 | 60.84 | 58.70 | 56.48 | i | ----- | z | ----- | z | 59.87 | ||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.71 | 60.60 | 56.97 | 53.62 | a | 47.77 | 42.39 | 53.51 | ||||||
| 1949 | 38.92 | 43.75 | 48.29 | 51.05 | 54.61 | 56.48 | 58.23 | 59.89 | 57.77 | 51.65 | 52.33 | c | 45.45 | 51.53 | ||||||||||||
| 1950 | 40.90 | 45.98 | 46.52 | 49.55 | 52.35 | 56.30 | b | 60.30 | d | 60.57 | a | 58.03 | 55.40 | 52.02 | a | ----- | z | 52.54 | ||||||||
| 1951 | ----- | z | 44.89 | i | 45.40 | 49.80 | 51.84 | 53.10 | 56.13 | 58.21 | 54.93 | 53.52 | 50.05 | 44.06 | 51.70 | |||||||||||
| 1952 | 42.42 | 44.72 | 44.44 | e | 49.03 | 51.67 | g | 53.30 | 55.81 | 56.52 | 54.72 | 52.27 | 47.48 | b | 46.24 | 49.72 | ||||||||||
| 1953 | 49.44 | 45.52 | 48.15 | 48.76 | a | 52.56 | 54.43 | 58.63 | 59.02 | 60.38 | a | 55.79 | 51.30 | 48.60 | 52.71 | |||||||||||
| 1954 | 44.34 | 48.18 | 47.03 | 48.57 | 51.97 | 54.77 | 56.90 | 56.90 | 58.73 | 55.35 | 52.25 | ----- | z | 52.27 | ||||||||||||
| 1955 | 43.69 | 46.70 | 44.78 | a | 48.44 | v | ----- | z | ----- | z | 56.37 | 57.11 | 57.82 | 52.45 | 47.45 | 46.77 | 50.35 | |||||||||
| 1956 | 46.63 | 42.84 | 45.66 | 49.23 | 54.29 | 55.88 | 58.79 | 59.18 | l | 56.82 | 54.03 | 49.82 | 46.47 | 50.95 | ||||||||||||
| 1957 | 41.87 | 47.75 | 48.61 | 50.73 | 54.85 | 58.73 | 61.50 | 61.27 | 60.78 | 56.16 | 51.27 | 50.50 | 53.67 | |||||||||||||
| 1958 | 50.98 | 53.00 | 49.65 | 51.32 | 55.21 | 59.38 | 59.26 | 60.63 | 60.58 | 56.05 | 51.57 | 52.66 | 55.02 | |||||||||||||
| 1959 | 49.34 | 49.89 | 49.82 | 52.88 | 54.60 | 58.33 | 58.66 | 58.42 | 58.58 | 56.53 | 52.68 | 49.92 | 54.14 | |||||||||||||
| 1960 | 48.47 | 49.10 | 51.73 | 51.33 | a | 53.82 | 58.77 | 55.47 | b | 59.08 | 56.25 | 54.69 | 50.33 | 50.66 | 53.31 | |||||||||||
| 1961 | 51.48 | 49.68 | 49.39 | 49.97 | a | 53.77 | 57.32 | 58.24 | 57.34 | 55.03 | 50.19 | 45.39 | l | 46.53 | 52.63 | |||||||||||
| 1962 | 45.18 | 46.83 | a | 47.44 | 50.63 | 52.85 | 55.57 | 58.68 | 60.00 | 59.42 | 56.06 | m | 51.63 | d | 50.10 | b | 52.58 | |||||||||
| 1963 | 45.79 | 53.25 | 47.15 | g | 47.56 | n | 53.61 | c | 56.24 | c | 59.72 | d | 58.32 | c | 60.19 | n | 55.78 | d | 50.67 | l | ----- | z | 54.67 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 46.20 | 47.00 | 47.88 | 49.96 | 52.70 | 55.96 | 58.85 | 59.35 | 57.97 | 54.50 | 50.26 | 47.66 | 52.70 | |||||||||||||
| S.D. | 3.35 | 2.95 | 2.77 | 2.33 | 2.77 | 2.76 | 2.16 | 2.28 | 1.72 | 1.74 | 2.69 | 2.47 | 1.30 | |||||||||||||
| SKEW | -0.43 | 0.00 | -0.41 | -0.65 | -0.92 | -1.37 | -0.35 | -0.73 | 0.31 | -0.49 | -1.61 | -0.08 | -0.18 | |||||||||||||
| MAX | 52.85 | 53.25 | 52.77 | 54.35 | 56.92 | 61.03 | 63.65 | 64.68 | 62.60 | 58.27 | 55.63 | 52.66 | 55.40 | |||||||||||||
| MIN | 37.95 | 38.84 | 39.56 | 43.35 | 44.98 | 46.00 | 53.68 | 51.94 | 54.72 | 50.19 | 39.42 | 42.39 | 50.19 | |||||||||||||
| NO YRS | 47 | 48 | 48 | 48 | 49 | 51 | 53 | 52 | 48 | 47 | 47 | 47 | 28 | |||||||||||||